We often store food so that we can eat it later. However if food is kept for a long time before it is eaten, it may start to "go off". This may be because it is attacked by its own enzymes, oxidized by the air or decomposed by bacteria and fungi. Therefore food preservation is very important. There are three main methods of preserving food. These are pasteurization and sterilization, refrigeration and freezing and drying. …showed first 75 words of 470 total…

…showed last 75 words of 470 total…added to food to lower the pH to an extent where bacteria cannot grow and enzymes are inhibited for example, mango is preserved as pickle. Food is sealed in plastic wrapping and exposed to low doses of x-rays which kill any bacteria in the food. This process is called irradiation. Therefore I conclude that there are various ways to preserve food and preservation of food is very important so as to be in good health.